the "collision" between earth and moon is entirely hypothetical in this context. yes there was probably a colision involved in the creation of the moon, but that is an entirely different storry that has no relevance to this thread besides the fact that it also involves the earth, the moon and the word colision. if you must continue a conversation about the origin of the moon please do it in a new thread, as any further exploration in this context will lead to more confusion and will ultimately do more harm than good